1 . Tom        full marks, but he was too careless        a spelling mistake.

A．could gain, to make	B．could have gained, to make
C．could have gained, and made	D．could have gained, as to make

2 . The construction of the laboratory_________ by the end of July.

A．must be completing

B．must complete

C．must have completed

D．must have been completed

3 . We had a wonderful time at Tom’s birthday party. You ____________, but why didn’t you?

A．should come	B．must have come
C．may have come	D．ought to have come

4 . William was late. He ____________ earlier if he was really serious about the interview.

A．may have come	B．should be coming
C．ought to have come	D．must have come

5 . —It’s already twelve o'clock, and he ____________ have been here half an hour ago.
—Maybe his flight was behind time.

A．must	B．ought to
C．may	D．can

6 . 一I think I saw Mr. Smith at yesterday's party.
一He ______ there. He is now on a business trip in Greece. And he left the day before yesterday.

A．mustn't have been	B．couldn't have been
C．might not be	D．should not be

7 . There was plenty of time. She __________ to the station.

A．mustn’t have hurried

B．couldn’t have hurried

C．must not hurry

D．needn’t have hurried

8 . I ________ have been more than six years old when the accident happened.

A．shouldn’t

B．couldn’t

C．mustn’t

D．needn’t

9 . ---Who can it be that hasn’t handed in his composition?
---It ______ be Robinson. He ______ it in yesterday.

A．will; should hand	B．must; should have handed
C．may; can’t hand	D．can; could have handed

10 . I was on the highway when this car went past, followed by a police car. They _______ at least 150 kilometers an hour.

A．should have been driving

B．must have been driving

C．could have driven

D．would have driven